050
FNCA52 TJSJ 010730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST SAT AUG 1 2026
DISCUSSION
MINIMUM RELATIVE HUMIDITY VALUES SHOULD REMAIN NEAR OR ABOVE
CRITICAL THRESHOLDS TODAY. INFLUX OF MOISTURE DURING THE WEEKEND
COULD AID IN IMPROVING OVERALL FIRE WEATHER CONDITIONS. HOWEVER,
CRITICALLY DRY FUELS PERSIST ACROSS SOUTHERN PUERTO RICO AND ST.
CROIX, WITH KEETCH-BYRAM DROUGHT INDEX (KBDI) VALUES REMAINING
WELL ABOVE THE CRITICAL THRESHOLD. EAST TO EAST-SOUTHEAST WINDS
ARE EXPECTED TO REMAIN ABOVE OR NEAR THE THRESHOLD VALUES TODAY,
SLIGHTLY WHICH COULD PROMOTE THE RAPID SPREAD OF ANY FIRE THAT
DEVELOPS. RESIDENTS AND VISITORS SHOULD AVOID OUTDOOR BURNING AND
EXERCISE CAUTION WITH ACTIVITIES THAT COULD GENERATE SPARKS OR
OPEN FLAMES, ESPECIALLY ACROSS AREAS WITH CRITICALLY DRY
VEGETATION.
PRZ014-012000-
SOUTHEAST COASTAL PLAINS-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 20
TEMP (24H TREND) 91 (+1) 74 (-2) 91
RH % (24H TREND) 55 (-4) 96 (+8) 58
WIND 20FT/EARLY(MPH) E 16 E 16 E 13
WIND 20FT/LATE(MPH) E 17 E 11 SE 13
MIXING HGT(FT-AGL/MSL)5350 4070
TRANSPORT WND (MPH) E 16 E 14
VENT RATE (KT-FT) 74900 48840
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-012000-
SOUTHERN HILLS-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 30
TEMP (24H TREND) 89 (+4) 70 (-3) 88
RH % (24H TREND) 59 (-5) 99 (+7) 63
WIND 20FT/EARLY(MPH) E 12 E 13 E 10
WIND 20FT/LATE(MPH) E 12 E 12 SE 11
MIXING HGT(FT-AGL/MSL)5900 5010
TRANSPORT WND (MPH) E 15 E 13
VENT RATE (KT-FT) 76700 55110
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-012000-
NORTH COASTAL PLAINS-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 30 60
TEMP (24H TREND) 91 (+2) 73 (-3) 90
RH % (24H TREND) 59 (-6) 100 (+7) 62
WIND 20FT/EARLY(MPH) E 13 E 18 E 13
WIND 20FT/LATE(MPH) E 21 SE 12 E 18
MIXING HGT(FT-AGL/MSL)5350 4530
TRANSPORT WND (MPH) E 16 E 13
VENT RATE (KT-FT) 74900 49830
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-012000-
NORTHERN HILLS-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 30 70
TEMP (24H TREND) 90 (+3) 71 (-1) 90
RH % (24H TREND) 62 (-4) 100 (+2) 66
WIND 20FT/EARLY(MPH) E 12 E 14 E 11
WIND 20FT/LATE(MPH) E 18 SE 9 E 14
MIXING HGT(FT-AGL/MSL)5760 5390
TRANSPORT WND (MPH) E 13 E 10
VENT RATE (KT-FT) 63360 48510
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-012000-
WEST COAST-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 20 60
TEMP (24H TREND) 92 (+1) 72 (-2) 92
RH % (24H TREND) 60 (-4) 99 (+3) 63
WIND 20FT/EARLY(MPH) E 12 E 13 E 12
WIND 20FT/LATE(MPH) E 13 E 11 E 12
MIXING HGT(FT-AGL/MSL)4440 4470
TRANSPORT WND (MPH) E 12 SE 12
VENT RATE (KT-FT) 44400 44700
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-012000-
EASTERN INTERIOR-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 70 40 40
TEMP (24H TREND) 89 (+2) 72 (-3) 89
RH % (24H TREND) 59 (-4) 100 (+6) 62
WIND 20FT/EARLY(MPH) E 13 E 14 SE 13
WIND 20FT/LATE(MPH) E 14 SE 14 E 14
MIXING HGT(FT-AGL/MSL)6590 5080
TRANSPORT WND (MPH) E 15 SE 14
VENT RATE (KT-FT) 85670 60960
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-012000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS TSTMS
CHANCE PRECIP (%) 70 50 50
TEMP (24H TREND) 85 (+3) 69 (-4) 86
RH % (24H TREND) 67 (-5) 100 (+4) 69
WIND 20FT/EARLY(MPH) E 12 SE 12 SE 11
WIND 20FT/LATE(MPH) E 12 SE 12 E 12
MIXING HGT(FT-AGL/MSL)4320 3970
TRANSPORT WND (MPH) E 16 SE 16
VENT RATE (KT-FT) 60480 55580
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-012000-
CENTRAL MOUNTAIN RANGE-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 30 60
TEMP (24H TREND) 87 (+5) 68 (-2) 86
RH % (24H TREND) 66 (-5) 100 (+2) 70
WIND 20FT/EARLY(MPH) E 9 E 9 SE 8
WIND 20FT/LATE(MPH) E 11 SE 6 E 8
MIXING HGT(FT-AGL/MSL)7140 6180
TRANSPORT WND (MPH) E 8 E 9
VENT RATE (KT-FT) 49980 49440
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-012000-
CAYEY MOUNTAIN RANGE-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 30
TEMP (24H TREND) 85 (+2) 70 (-2) 85
RH % (24H TREND) 67 (-1) 100 (+3) 69
WIND 20FT/EARLY(MPH) E 11 E 11 SE 10
WIND 20FT/LATE(MPH) E 11 SE 10 E 11
MIXING HGT(FT-AGL/MSL)5630 4400
TRANSPORT WND (MPH) E 16 SE 15
VENT RATE (KT-FT) 78820 57200
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-012000-
VIEQUES-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 40
TEMP (24H TREND) 90 (+1) 77 (-3) 90
RH % (24H TREND) 56 (-3) 90 (+7) 57
WIND 20FT/EARLY(MPH) E 16 E 18 SE 13
WIND 20FT/LATE(MPH) E 17 SE 17 E 13
MIXING HGT(FT-AGL/MSL)3420 3280
TRANSPORT WND (MPH) E 18 E 17
VENT RATE (KT-FT) 54720 49200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-012000-
CULEBRA-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS
CHANCE PRECIP (%) 60 50 40
TEMP (24H TREND) 90 (+1) 78 (-2) 91
RH % (24H TREND) 60 (-5) 92 (+9) 60
WIND 20FT/EARLY(MPH) E 16 E 19 E 14
WIND 20FT/LATE(MPH) E 17 E 18 E 14
MIXING HGT(FT-AGL/MSL)3440 3380
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 55040 54080
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-012000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 30
TEMP (24H TREND) 92 (+1) 74 (-2) 92
RH % (24H TREND) 55 (-3) 95 (+9) 59
WIND 20FT/EARLY(MPH) E 17 E 18 E 16
WIND 20FT/LATE(MPH) SE 19 E 16 SE 17
MIXING HGT(FT-AGL/MSL)5050 4620
TRANSPORT WND (MPH) E 18 E 16
VENT RATE (KT-FT) 80800 64680
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-012000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 40
TEMP (24H TREND) 89 (+2) 76 (-4) 89
RH % (24H TREND) 60 (-5) 91 (+8) 61
WIND 20FT/EARLY(MPH) E 16 E 19 E 14
WIND 20FT/LATE(MPH) E 18 E 19 E 16
MIXING HGT(FT-AGL/MSL)3260 3140
TRANSPORT WND (MPH) E 20 E 20
VENT RATE (KT-FT) 55420 53380
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-012000-
ST CROIX-
330 AM AST SAT AUG 1 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 30
TEMP (24H TREND) 89 (+1) 77 (-3) 90
RH % (24H TREND) 63 (-2) 94 (+8) 63
WIND 20FT/EARLY(MPH) E 16 E 18 E 14
WIND 20FT/LATE(MPH) E 18 E 14 E 14
MIXING HGT(FT-AGL/MSL)3690 4340
TRANSPORT WND (MPH) E 20 E 18
VENT RATE (KT-FT) 62730 69440
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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